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SIST EN ISO 9612:2009
01-julij-2009
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SIST ISO 9612:1998
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Acoustics - Determination of occupational noise exposure - Engineering method (ISO
9612:2009)
Akustik - Bestimmung der Lärmexposition am Arbeitsplatz - Verfahren der
Genauigkeitsklasse 2 (Ingenieurverfahren) (ISO 9612:2009)
Acoustique - Détermination de l'exposition au bruit en milieu de travail - Méthode
d'expertise (ISO 9612:2009)
Ta slovenski standard je istoveten z: EN ISO 9612:2009
ICS:
13.140 Vpliv hrupa na ljudi Noise with respect to human
beings
SIST EN ISO 9612:2009 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 9612:2009
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SIST EN ISO 9612:2009
EUROPEAN STANDARD
EN ISO 9612
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2009
ICS 13.140
English Version
Acoustics - Determination of occupational noise exposure -
Engineering method (ISO 9612:2009)
Acoustique - Détermination de l'exposition au bruit en Akustik - Bestimmung der Lärmexposition am Arbeitsplatz -
milieu de travail - Méthode d'expertise (ISO 9612:2009) Verfahren der Genauigkeitsklasse 2 (Ingenieurverfahren)
(ISO 9612:2009)
This European Standard was approved by CEN on 5 March 2009.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 9612:2009: E
worldwide for CEN national Members.
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SIST EN ISO 9612:2009
EN ISO 9612:2009 (E)
Contents Page
Foreword .3
2
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SIST EN ISO 9612:2009
EN ISO 9612:2009 (E)
Foreword
This document (EN ISO 9612:2009) has been prepared by Technical Committee ISO/TC 43 "Acoustics" in
collaboration with Technical Committee CEN/TC 211 “Acoustics” the secretariat of which is held by DS.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by October 2009, and conflicting national standards shall be withdrawn at
the latest by October 2009.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 9612:2009 has been approved by CEN as a EN ISO 9612:2009 without any modification.
3
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SIST EN ISO 9612:2009
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SIST EN ISO 9612:2009
INTERNATIONAL ISO
STANDARD 9612
Second edition
2009-04-01
Acoustics — Determination of
occupational noise exposure —
Engineering method
Acoustique — Détermination de l'exposition au bruit en milieu de
travail — Méthode d'expertise
Reference number
ISO 9612:2009(E)
©
ISO 2009
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SIST EN ISO 9612:2009
ISO 9612:2009(E)
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© ISO 2009
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Published in Switzerland
ii © ISO 2009 – All rights reserved
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SIST EN ISO 9612:2009
ISO 9612:2009(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Symbols . 4
5 Instrumentation. 5
6 Methodology — Chronological steps . 6
7 Work analysis. 7
8 Selection of measurement strategies. 8
9 Strategy 1 — Task-based measurement.9
10 Strategy 2 — Job-based measurement . 12
11 Strategy 3 — Full-day measurement. 14
12 Measurements. 15
13 Sources of uncertainty. 17
14 Calculation of measurement uncertainties and presentation of the final results. 19
15 Information to be reported. 19
Annex A (informative) Example of a checklist to ensure that significant noise events are detected
during the work analysis. 21
Annex B (informative) Guide to the selection of measurement strategy . 22
Annex C (normative) Evaluation of measurement uncertainties . 25
Annex D (informative) An example showing calculation of daily noise exposure level using task-
based measurements . 33
Annex E (informative) An example showing calculation of daily noise exposure level using
job-based measurements . 37
Annex F (informative) Sample calculation of daily noise exposure level using full-day
measurements. 40
Bibliography . 43
© ISO 2009 – All rights reserved iii
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SIST EN ISO 9612:2009
ISO 9612:2009(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 9612 was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise.
This second edition cancels and replaces the first edition (ISO 9612:1997), which has been technically revised.
iv © ISO 2009 – All rights reserved
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SIST EN ISO 9612:2009
ISO 9612:2009(E)
Introduction
This International Standard provides a stepwise approach to the determination of occupational noise exposure
from noise level measurements. The procedure contains the following major steps: work analysis, selection of
measurement strategy, measurements, error handling and uncertainty evaluations, calculations, and
presentation of results. This International Standard specifies three different measurement strategies: task-
based measurement; job-based measurement; and full-day measurement. This International Standard gives
guidance on selecting an appropriate measurement strategy for a particular work situation and purpose of
investigation. This International Standard also provides an informative spreadsheet to allow calculation of
measurement results and uncertainties. ISO is not responsible for errors that may arise or occur with the use
of this spreadsheet.
This International Standard recognizes the use of hand-held sound level meters as well as personal sound
exposure meters. The methods specified optimize the effort required for obtaining a given accuracy.
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SIST EN ISO 9612:2009
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SIST EN ISO 9612:2009
INTERNATIONAL STANDARD ISO 9612:2009(E)
Acoustics — Determination of occupational noise exposure —
Engineering method
1 Scope
This International Standard specifies an engineering method for measuring workers’ exposure to noise in a
working environment and calculating the noise exposure level. This International Standard deals with
A-weighted levels but is applicable also to C-weighted levels. Three different strategies for measurement are
specified. The method is useful where a determination of noise exposure to engineering grade is required, e.g.
for detailed noise exposure studies or epidemiological studies of hearing damage or other adverse effects.
The measuring process requires observation and analysis of the noise exposure conditions so that the quality
of the measurements can be controlled. This International Standard provides methods for estimating the
uncertainty of the results.
This International Standard is not intended for assessment of masking of oral communication or assessment
of infrasound, ultrasound and non-auditory effects of noise. It does not apply to the measurement of the noise
exposure of the ear when hearing protectors are worn.
Results of the measurements performed in accordance with this International Standard can provide useful
information when defining priorities for noise control measures.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 1999, Acoustics — Determination of occupational noise exposure and estimation of noise-induced
hearing impairment
ISO/IEC Guide 98-3, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in
measurement (GUM:1995)
IEC 60942:2003, Electroacoustics — Sound calibrators
IEC 61252, Electroacoustics — Specifications for personal sound exposure meters
IEC 61672-1:2002, Electroacoustics — Sound level meters — Part 1: Specifications
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
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SIST EN ISO 9612:2009
ISO 9612:2009(E)
3.1
A-weighted time-averaged sound pressure level
L
p,A,T
A-weighted equivalent continuous sound pressure level
L
p,A,eqT
ten times the logarithm to the base 10 of the ratio of the time average of the square of the A-weighted sound
pressure, p , during a stated time interval of duration T (starting at t and ending at t ), to the square of a
A 1 2
reference value, p , expressed in decibels
0
t
⎡⎤2
1
2
⎢⎥
pt()dt
A
∫
⎢⎥T
t
⎢⎥1
LL== 10 lg dB (1)
pT,A, p,A,eqT
2
⎢⎥
p
0
⎢⎥
⎢⎥
⎢⎥
⎣⎦
where the reference value, p , is 20 µPa
0
[9]
NOTE Adapted from ISO/TR 25417:2007 .
3.2
A-weighted noise exposure level normalized to an 8 h working day
daily noise exposure level
L
EX,8h
〈occupational noise〉 level, in decibels, given by the equation:
⎡⎤T
e
LL=+10 lg dB (2)
⎢⎥
EX,8h pT,A,eq
e
T
⎣⎦0
where
L is the A-weighted equivalent continuous sound pressure level for T ;
p,A,eqT e
e
T is the effective duration, in hours, of the working day;
e
T is the reference duration, T = 8 h
0 0
NOTE 1 If the effective duration of the working day, T , is equal to 8 h, then L equals L .
e EX,8h p,A,eq,8h
NOTE 2 If the average or normalized exposure over a number of days is desired, Equation (3) can be used:
X
⎡⎤
1 0,1× L
EX,8h,x
L = 10 lg 10 dB (3)
EX,8h⎢⎥
∑
X
⎢⎥
⎣⎦x=1
The value of X is chosen according to the purpose of the averaging process. For example, X = 5 leads to a daily noise
exposure level normalized to a nominal week of five 8 h working days.
[9]
NOTE 3 This definition differs from that given in ISO/TR 25417:2007 .
3.3
nominal day
working day over which it is chosen to determine the noise exposure
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SIST EN ISO 9612:2009
ISO 9612:2009(E)
NOTE 1 The nominal day is determined from the work analysis and depends on the purpose of the measurements. For
example, it may be a typical day representing the work performed over several days or the day with the highest noise
exposure. See also 7.3.
NOTE 2 The noise exposure level is normally calculated on a daily basis, but there may be circumstances where the
use of weekly or longer periods of noise exposure is considered appropriate.
3.4
C-weighted peak sound pressure level
L
p,Cpeak
ten times the logarithm to the base 10 of the ratio of the square of the C-weighted peak sound pressure,
p , to the square of a reference value, p , expressed in decibels
Cpeak 0
2
p
Cpeak
L = 10 lg dB (4)
p,Cpeak
2
p
0
where the reference value, p , is 20 µPa.
0
3.5
task
〈occupational noise〉 distinct part of a worker's occupational activity
Figure 1 illustrates the hierarchy of jobs and tasks.
3.6
job
〈occupational noise〉 overall occupational activity that is carried out by a worker, consisting of all the tasks
performed by the worker during the entire working day or shift
NOTE A worker often has a job title that describes his or her job, sometimes complemented with an additional
description to ensure clear identification, e.g. “welder - process line A”.
Figure 1 illustrates the hierarchy of jobs and tasks.
Key
Job 1 scaffolders Task 1 planning
Job 2 welders Task 2 grinding
Job 3 painters Task 3 welding
Job 4 store keepers
Figure 1 — An example illustrating the hierarchy of jobs and tasks
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SIST EN ISO 9612:2009
ISO 9612:2009(E)
4 Symbols
c sensitivity coefficient related to each input quantity —
i
c sensitivity coefficient associated with job noise level sampling —
1
c sensitivity coefficient associated with noise level sampling of task m —
1a,m
−1
c sensitivity coefficient associated with estimation of duration of task m dB h
1b,m
c sensitivity coefficient associated with measurement instrumentation —
2
c sensitivity coefficient associated with microphone position —
3
i task sample number —
I the total number of task samples —
j number of observations of task duration —
J total number of observations of task duration —
k coverage factor related to a confidence interval —
K denominator as given in C.3.3, Note 2 —
N
L A-weighted noise exposure level normalized to a nominal 8 h working day dB
EX,8h
L A-weighted noise exposure level normalized to a nominal 8 h working day averaged
EX,8h
over a number of days dB
L A-weighted noise exposure level of task m contributing to the daily noise exposure level dB
EX,8h,m
*
L estimate of the true A-weighted equivalent continuous sound pressure level for task m dB
pT,,A,eqm
L = L A-weighted equivalent continuous sound pressure level over a period T dB
p,A,T p,A,eqT
L A-weighted equivalent continuous sound pressure level for task m dB
p,A,eqT,m
L arithmetic average of a number of samples of the A-weighted equivalent continuous
p,A,eqTm,
sound pressure levels for task m dB
L A-weighted equivalent continuous sound pressure level of job sample n dB
p,A,eqT,n
L A-weighted equivalent continuous sound pressure level for the effective duration
p,A,eqT
e
of the working day dB
L C-weighted peak sound pressure level dB
p,Cpeak
m task number —
M total number of tasks —
n job sample number —
N total number of job samples —
n number of workers in a homogenous exposure group —
G
−5
p reference value; p = 2 × 10 Pa Pa
0 0
p A-weighted sound pressure Pa
A
p C-weighted peak sound pressure Pa
Cpeak
Q correction for measurement instrumentation dB
2
Q correction for microphone position dB
3
t duration of measurement as described in Figure 2 h
T time period over which an average is taken h
T reference duration; T = 8 h h
0 0
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SIST EN ISO 9612:2009
ISO 9612:2009(E)
T effective duration of the working day h
e
T duration of task m h
m
T duration of sample j of task m h
m,j
T duration of job sample n h
n
U expanded uncertainty dB
u combined standard uncertainty dB
u standard uncertainty of each input quantity dB
i
u standard uncertainty of the energy average of a number of measurements of A-weighted
1
equivalent continuous sound pressure level dB
*
u estimated standard uncertainty of a number of measurements of A-weighted equivalent
1
continuous sound pressure level dB
u standard uncertainty due to noise level sampling of task m dB
1a,m
u standard uncertainty due to the estimation of duration of task m h
1b,m
u standard uncertainty due to the instrumentation dB
2
u standard uncertainty due to the instrumentation in the task method dB
2,m
u standard uncertainty due to microphone position dB
3
x day number —
X total number of days —
5 Instrumentation
5.1 Sound level meters and personal sound exposure meters
Measurements can be made by using either integrating-averaging sound level meters or personal sound
exposure meters.
Sound level meters, including the microphone and associated cables, shall meet the requirements for
IEC 61672-1:2002, class 1 or class 2 instrumentation. Class 1 instrumentation is preferred and should be
used when measuring at very low temperatures or when the noise is dominated by high frequencies (see also
Note 3).
Personal sound exposure meters, including the microphone and cable, shall meet the requirements specified
in IEC 61252. Personal sound exposure meters fulfilling the requirements of IEC 61672-1:2002, class 1, are
recommended and should be used when measuring at very low temperatures or when the noise is dominated
by high frequencies (see also Notes 2 and 4).
[10] 1) [11] 1)
NOTE 1 Most sound level meters that meet the requirements of IEC 60651:2001 and IEC 60804:2000 also
meet the acoustic requirements of IEC 61672-1:2002.
NOTE 2 “Personal sound exposure meter” is often referred to as “noise dose meter” or “noise dosimeter” (North
America).
NOTE 3 For IEC 61672-1:2002, class 1 instruments, the specified tolerance limits are applied for the temperature
range from −10 °C to +50 °C. For instrumentation in accordance with IEC 61672-1:2002, class 2, and for personal sound
exposure meters in accordance with IEC 61252, the influence of variations in the air temperature on the measured signal
level is specified over the range from 0 °C to +40 °C. In order to maintain accuracy when performing measurements
outside this temperature range, it can be necessary to use an instrument for which the manufacturer specifies compliance
1) Superseded.
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SIST EN ISO 9612:2009
ISO 9612:2009(E)
for a wider temperature range. Alternatively, a sound level meter in accordance with IEC 61672-1:2002, class 1, may be
selected. In cold conditions, the measuring instrument may be kept warm, e.g. under clothing, such that only the
microphone is exposed to low temperatures.
NOTE 4 The choice of the instrumentation influences the uncertainty of the measurements.
NOTE 5 For personal sound exposure meters, IEC 61252 allows wide tolerances in the frequency characteristics
above 4 000 Hz, which can lead to incorrect measurement of high frequency sound such as that from air nozzles. In order
to reduce the uncertainty when measuring noise dominated by high frequencies, it may be necessary to use a measuring
instrument for which the manufacturer specifies high frequency characteristics within a narrower tolerance range.
Alternatively, a sound level meter specified in accordance with IEC 61672-1:2002, class 1, may be selected.
Personal sound exposure meters can have a cut-off level at around 70 dB. It should be checked whether this
influences the measurement result.
5.2 Calibrator
The calibrator shall meet the requirements specified in IEC 60942:2003, class 1.
5.3 Periodic verification
The calibration of the sound calibrator and the compliance of the instrumentation system with the
requirements of IEC 61672-1, IEC 61252 and other relevant standards shall be verified at intervals in a
laboratory making calibrations traceable to appropriate standards.
Unless national regulations dictate otherwise, it is recommended that the sound calibrator and the compliance
of the instrumentation system with the requirements of IEC 61672-1 be verified at intervals not exceeding
2 years.
The date for the last periodic verification and the name of the laboratory that performed it shall be recorded
and given in the measurement report.
6 Methodology — Chronological steps
6.1 Step 1: Work analysis
The work analysis shall provide sufficient information about the work and the workers under consideration so
that an appropriate measurement strategy can be selected and measurements can be planned. Work analysis
shall be carried out in accordance with Clause 7.
6.2 Step 2: Selection of the measurement strategy
A measurement strategy shall be selected from task-based measurement, job-based measurement or full-day
measurement as specified in Clause 8. More than one measurement strategy may be used, if relevant (see
Clause B.6).
6.3 Step 3: Measurements
The basic measurement quantity shall be L . In addition, L shall be measured, if relevant. The
p,A,eqT p,Cpeak
measurements shall follow the chosen strategy as specified in one of Clauses 9, 10 or 11 and comply with the
requirements of Clause 12.
6.4 Step 4: Error handling and uncertainties
Sources of errors and uncertainties that may influence the result shall be evaluated in accordance with
Clauses 13 and 14.
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SIST EN ISO 9612:2009
ISO 9612:2009(E)
6.5 Step 5: Calculation and presentation of results and uncertainty
Calculate L as specified for the selected strategy (see Clauses 9, 10, and 11) and the uncertainty as
EX,8h
specified in Annex C. The results and uncertainties can be calculated by using the spreadsheet provided with
this International Standard.
The results shall be presented as specified in Clause 15. Annexes D, E, and F provide practical examples for
the task-based, job-based, and full-day measurements, respectively.
7 Work analysis
7.1 Introduction
Work analysis is required in all situations. It shall provide the information necessary to:
a) describe the activities of the enterprise and the jobs of the workers under consideration;
b) define homogeneous noise exposure groups (see 7.2), if relevant;
c) determine a nominal day or days for each worker or group;
d) identify tasks which make up the jobs, if relevant;
e) identify possible significant noise events;
f) choose the measurement strategy;
g) establish the measurement plan.
The work shall be analysed with emphasis put on production, process, organization, workers and activities.
The measurements may be performed by using the task-based, job-based or full-day strategy. Whichever
strategy is used, it is essential to identify all events which are significant with regard to noise exposure and to
make sure that the measurement plan takes them into account. See Annex A for an example of a checklist.
NOTE The order in which the items above are performed can depend on the complexity of the situation on site. The
items are strongly connected, and the process can therefore be iterative in complex situations, i.e. increased knowledge
about one of the items can result in a new description or redefinition of others.
7.2 Defining homogeneous noise exposure groups
Measurement efforts can be reduced by defining homogeneous noise exposure groups. These are groups of
workers that are performing the same job and are expected to have similar noise exposures during the
working day. If used, the homogeneous noise exposure group shall be clearly identified and can consist of
one or more workers.
NOTE A homogeneous noise exposure group is also called similar noise exposure group US.
Homogeneous noise exposure groups can be defined in a number of ways. For example, it may be possible to
define such groups according to job title, function, work area or profession. Alternatively, the groups can be
...